Another vote for an old browning. Most machine shops can bore out the fixed chokes if you like. Light Modified will do well for trap or sporting, IC for Skeet or sporting, full cylinder or skeet if you want to play the skeet game.
If you pay for a good gun to start, it will save many years of buying and selling.
As long as you keep it clean and dry, you probably wont go too far wrong with a good ol Citori